Bone-derived spacer assembly

摘要

An allograft interspinous spacer for implantation into an interspinous space located between spinous process of adjacent vertebrae. The spacer preferably includes a body, a core and a plurality of deployable retainers. The body may be operatively associated with the plurality of deployable retainers. In use, after the body has been inserted into the interspinous space, the plurality of retainers is deployed so that they prevent migration of the spacer. The core is preferably sized and configured to be inserted and/or moved into operatively engagement with the body to deploy the plurality of retainers.

主权项

1. An interspinous spacer for insertion into an interspinous space between spinous processes of adjacent vertebrae, the spacer comprising:
a body including a top bone contacting surface, a bottom bone contacting surface, a first side surface, a second side surface, a leading end, a trailing end and a bore extending through the body from an opening in the trailing end in a direction towards an opening in the leading end, an external boundary surface of the body defined by the top and bottom bone contacting surfaces, the first and second side surfaces, the leading end and the trailing end; a plurality of deployable retainers positioned at the top and bottom bone contacting surfaces of the body, each of the plurality of deployable retainers located at a position adjacent to a respective one of the leading end and the trailing end, each of the plurality of deployable retainers including a projection extending into the bore where a distance that the projection extends into the bore increases along the projection from the respective one of the leading and trailing ends towards a midline of the body; and a core including a top surface, a bottom surface, a first side surface, a second side surface, a leading end and a trailing end, the core being movably receivable within the bore formed in the body and at least a portion of the core extends from the opening in the trailing end and the opening in the leading end when the core is received within the body, the body, plurality of deployable retainers and the core being constructed of bone, wherein the body being sized and configured for implantation into the interspinous space with the plurality of retainers in a first, insertion configuration, wherein the plurality of retainers are located generally within the external boundary surface, the retainers being urged to a second, deployed position by inserting the core into the bore and along the projections of the retainers such that at least a portion of the plurality of deployable retainers extends from the external boundary surface, in the second, deployed position, the retainers located adjacent the spinous processes.